Manitowoc STH042 4/16, Technician'S Handbook

Page: 131 / 146

Part Number STH042 4/16 131
U0240 SELF-CONTAINED AIR-COOLED
NOTE: These characteristics may vary depending on
operating conditions.
Cycle Times
Freeze Time + Harvest Time = Total Cycle Time
Air Temp.
Entering
Condenser
°F/°C
Freeze Time Harvest
Time
Water Temperature °F/°C
50/10 70/21 90/32
70/21 14.1-16.1 17.0-19.3 18.6-21.1
1.0-2.5
80/27 15.2-17.4 18.0-20.5 20.5-23.3
90/32 16.5-18.8 20.5-23.3 22.7-25.8
100/38 19.2-21.8 21.9-24.9 23.6-26.8
110/43 21.9-24.9 23.6-26.8 24.5-27.8
Times in minutes
24 Hour Ice Production
Air Temp.
Entering
Condenser
°F/°C
Water Temperature °F/°C
50/10 70/21 90/32
70/21 225 190 175
80/27 210 180 160
90/32 195 160 145
100/38 170 150 140
110/43 150 140 135
Based on average ice slab weight of 2.44 - 2.75 lb (1107 – 1247 g).
Regular cube derate is 7%
Operating Pressures
Air Temp.
Entering
Condenser
°F/°C
Freeze Cycle Harvest Cycle
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
50/10 220-275 65-32 145-200 85-110
70/21 220-310 75-34 155-210 90-120
80/27 270-330 80-36 175-225 90-140
90/32 290-350 80-38 185-245 90-150
100/38 320-410 85-39 200-260 90-155
110/43 355-430 90-40 220-280 90-160
Suction pressure drops gradually throughout the freeze cycle